Before becoming a pilot, he spent quite a long time ____.A．to be trainedB．being_刷题宝

题干

Before becoming a pilot, he spent quite a long time ____.

A．to be trained

B．being trained

C．training

D．to train

上一题下一题 0.85难度单项选择更新时间:2010-09-29 11:27:23

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